Preparation of fly ash/slag based geopolymer concrete by different retardation methods

• Main Authors: QIU, ZONG-XIAN, 邱宗弦
• Other Authors: CHENG, TA-WUI
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/4vspdf

碩士 === 國立臺北科技大學 === 資源工程研究所 === 107 === Herein study, geopolymer concrete was prepared by using fly ash and slag. The first stage is the slurry retardation test. It is found that sucrose and Terminalia chebula can effectively delay the hardening time. Besides, the reduction of SiO2/Na2O and the reduction of SiO2/Al2O3 can effectively delay the hardening time. As found in the ready-mixed plant test, the moisture content of the fine granules has a significant influence on the geopolymer. Therefore, the second stage of the study will test the fine granules. The moisture content of the material is controlled from 0% to 10%. The second stage is the mortar retarding test. The mortar is prepared by using fine particles with a water content of 10% and a liquid-solid ratio of 0.7, which can effectively delay the hardening time. The initial setting time is about 2 to 11 hours, and the final setting time is about 23 to 31. Hours and the compressive strength can reach 30MPa or more. Since the ready mixing plant cannot control the moisture content of the fine granules and the moisture content of the fine granules is 5%, there is no effect of delaying the hardening time. Therefore, the water content of the fine granules is controlled to be more than 5%, and it is expected to be delayed hardening time. In the third stage, the concrete is prepared by using fine granules with a moisture content of 8% or higher and a liquid/ash ratio of 0.7 or 0.75, which can effectively delay the hardening time. The initial setting time is about 18 to 63 hours, and the final setting time is about 31. ~97 hours, and the compressive strength can reach 21MPa or more.